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T4-2 , T4-4(withbtwomcpu) has two pci_bus
T4-4 has four pci_bus
each pci_bus can associated with root domain that has direct access to physical device with pcie slots ofthe pci_ bus.
one can run zone inside these root domain.
IMHO, these zone will run better than v490 for you db prod.
for T4-4 one can use one RD as production and one RD as dev env
your webs env can all run inside zone in another RD
I think what you looking for is LDOM instead zone. Base on your description, your practice is base on Solaris 10 and you have a patch management practice so base on that my recommendation will be using LDOM (Oracle VM for SPARC) this way you can have different patch level kernel concurrent on same T4.